Blue tooth Chip:JL6904 Blue tooth Version:V4.2 Drive Unit:40mm Input Voltage:DC 5V Working Voltage:3.7V Impedance:32Ω±15% Frequency Response:20-20KHz Playing Time:8-10H Standby Time:60 days 1.Precise structure, the 40mm powerful drive unit improves the sound's malleability and richness 2.Soft material, cover and handle are made of soft silky meringue leather, not easy to destroy, comfortable and durable 3.10 meters transmission distance, wireless connection free listening, free from wire constraints